Instrument for inside measurements



May l5, 1951 H. HAIDEGGER 2,553,086

INSTRUMENT FOR INSIDE MEASUREMENTS Filed Nov. 14, 1947 2 Sheets-Sheet 1 May l5, 1951 H. HAIDEGGER INSTRUMENT FOR INSIDE MEASUREMENTS 2 Sheets-Sheet 2 Filed Nov. 14, 1947 fil-,IE

lux" 441/ Patented May 15, 1951 UNITED` STATES TENT' GFFECE INSTRUMENT FOR NSIDE MEASUREMENTS Hans Haidegger, Solothurn, Switzerland, assigner to Ebauches S. A., Grenchen, Solothurn, Switzerland, a joint-stock company of Switzerland Application November 14, 1947, Serial No. 785,832

In Switzerland June 1, 1944 Section 1, Public Law 690, August 8, 1946 Patent expires June 1, 1964 An object of the invention is to provide they head with a bore normal to the feeler-stud and of a workpiece, the instrument is introduced into to provide transparent means in reach of said the workpiece, with the axis of the handle at an bore allowing direct reading of the result.; by angle to the axis of the bore to be measured and looking through said bore. then turned in such a direction as to bring the Other objects and features will be apparent as axis of the stud 5 into a cross-sectional plane of the following description proceeds, reference the work-piece to measured. Owing to the being had to the accompanying drawings which, action of the braire-pin I5, the feeler-stud reby way of examples, show two embodiments of mains in the innermost position thereof. Then the invention. the instrument is taken out of the work piece and Fig. 1 is an axial section through the first ex- 15 the magnifying lens I3 held to the eye looking ample, through the axial bore in the head i, in which the Fig. 2, an axial section through a part of this indicating means i, IFB and the lens I3 are arrst embodiment and in an opposite plane at ranged, in the direction of the transparent cover right angles to Fig. 1. 22 so that the desired measurement can be read Fig. 3 shows the nonius and 20 with the aid of the scale and nonius. Afterwards, Fig. 4, the scale, both on a much larger scale. the end of the tube 2i provided with the cover 22 Fig. 5 is an axial section through the second is pressed against the head i whereby the piston embodiment. Y IQ presses the pin i5, seen in Fig. 2, to the right. Fig. 6 is a section along line VI-`VI in Fig. 5, The conical part I@ oi the lpin I5 disengages the and slot It so that the spring I3 can bring the feeler- Fig. '7 a section along line VII- VII in Fig. 6. stud 5 into the outermost initial position thereof. The head I with spherical surface 2 is screwed The embodiment shown in Figs. 5 to '7 diiers to the handle 3. The head I has on one side a from that shown in Figs. l-4 in that the results caliper face 24 and oppositely thereto a radial are not read through an axial bore of the head I bore 4 which i-s open at one end and in which the 3o and through the handle, but through a bore of bolt-shaped feeler-stud 5 slides, projecting the head I extending substantially in radial dithrough the onen end thereof. The feeler-stud rection. Here too, the head I with spherical sur- 5 is slotted as at 6 and carries in this part a face 2 is screwed to the handle 3 and has a radial transparent scale 'I' which is shown separately in bore i in which bolt-shahed ieeler-stud 5 is Fig. 4 and the graduation of which corresponds :as slidably arranged. stud 5 is slotted as at 6 to the range of measurement of the instrument. and carries in this part a transnarent scale T of In a setting 9 within the axial bore 6a is fixed a the kind shown in Fig. 4. In the Si'ng 9, 112Wn transparent disc iii with `a nonius il or an index ing radial for correct adjustment on assemline. For correct adjustment on assembly, the bly in the head i, is xed a transparent discl II! setting 9 in the head I has radial play. It is held m with a nonius or an index line. it is clamped fast fast by means of the hollow nut I2. On the side by means of a hollow nut .A hoilow nut I 2a of the feeler-stud 5 opposite to the disc IIJ, a mag carries a transparent disc 33. On the side of the' nifying means such as a magnifying lens I3 is Stud 5 OhlOOSlf? t0 the d150 il? magnifying 1BRS fitted. The feeler-stud 5 is held lin the denite I3 is xed in the head. indicating means 'I and position taken up during reading by an automatic l 5i and 1611s i3 @XS B1 lying in EL bOl@ @Xtldllg in Wedge-brake which includes a pin' i5 extending substantially r ',.l direction through the head through slots I4 of the roeier-stud having a coni- I normal to the .iai bore 1I. cal part I6 cooperating with one of the slots ifi, The automatic wedge-brake, holding the stud which has a conical form. The pin I5 servesI at is in the definite position teiten up after feeling, the same time to support the guide-pin I1 of the is as follows: The pin i5 traverses the slots I4 of spring I8 which tends to move the roeier-stud 5 the feeler-stud 5 and eas a conical :part I6 (Fig. outwards. As shown in Fig. 2, the pin I5 is bevm 7) cooperating for br `ig vwith one of the slots eled at one of the ends thereof and remains thereu E4 which is shaped coni-sally. The pin I 5 serves' with in contact with a mobile piston I9 being at the same time to support the guide pinilaoi parallel the axis of the handle and extending into the spring it tending to move the Stud 5 outthe inside of the handle 3.

Gn the upper end oi the piston I9 lies the edge of a thiinble 2@ which. is fixed to a sliding tube 2l inside the handle 3. The tube 2l is closed at the upper end by a transparent cover 22.

.if it is desired to measure the inside diameter wards. As Fig. 5 shows, the pin I5 is inl contact With a piston I9a slidably arranged in a tube 24 of the handle 3. In the tube 24 a cock 25 is arranged behind the piston Iiia. The cock has a groove 25 engaged by a lever 2'? provided with e, press button 28, traversing a slot 3l of the tube 24. A nose 29 of the press lever 27 bears against a ring 30 supported on the free end of the tube 24. A spring 32 arranged ins-ide the handle 3 with one end thereof supported on this handle, urges the cock 25 against the piston lea and, thus, holds the pin I5 in braking position.

If an inside dimension of a workpiece has to be measured, the instrument is introduced and manipulated as described with regard to the first embodiment. The pin I5 rst holds the feelerstud 5 in the definite position. Then the instrument is taken out of the work piece and the magnifying lens I3 is held to the eye looking through the bore of the head I in substantially radial direction towards the disc I0. Afterwards, the button 28 is pressed whereby the cock 25 compresses the spring 32 and releases the piston I 9a. Thereby, the brake-pin I5 is released, so that the spring I8 can bring the feeler-stud 5 into its outermost initial position. By releasing the button 28, the spring 32 is made to press upon the cock 25 and to bring the pin I5 into braking position by means of the piston I-9a.

What I claim is:

1. In an indicating inside caliper, in combination, an elongated handle; a head fixed to said handle at one end thereof and provided with a hole being open at one end and located perpendicularly to said handle and a bore being open at both ends and extending through said head and intersecting said hole, said head having a caliper face on that side of said head which is located opposite said open end of said hole; a feeler stud arranged slidably in said hole projecting at its front end through said open end of said hole and passing through the intersection of said hole with said bore, said feeler stud being shaped so as to form a passage for a light beam at least through a part of said bore at its intersection with said hole; and position indicating means provided at least partly Within said head and including an indicating part on said feeler stud arranged within said passage for said light beam passing through said bore, so that said indicating part and changes in the position thereof can be observed by looking through said bore.

2. In an indicating inside caliper, in combination, an elongated handle; a head xed to said handle at one end thereof and provided with a hole being open at one end and located perpendicularly to said handle and a bore being open at both ends and extending through said head perpendicularly to said hole and intersecting the same, said head having a caliper face on that side of said head which is located opposite said open end of said hole; a feeler stud arranged slidably in said hole projecting at its front end through said open end of said hole and passing through the intersection of said hole with said bore, said feeler stud being shaped so as to form a passage for a light beam at least through a part of said bore at its intersection with said hole; and position indicating means provided at least partly within said head and including an indicating part on said feeler stud arranged within said passage for said light beam passing through said bore, so that said indicating part and changes in the position thereof can be observed by looking through said bore.

3. In an indicating inside caliper, in combination, an elongated handle; a head fixed to said handle at one end thereof and provided with a hole being open at one end and located perpendicularly to said handle and a bore being open at both ends and extending through said head perpendicularly to said hole and intersecting the same, said head having a caliper face on that side of said head which is located opposite said open end of said hole; a feeler stud arranged slidably in said hole projecting at its front end through said open end of said hole and passing through the intersection of said hole with said bore, said feeler stud having an opening permitting passage of a light beam at least through a part of said bore at its intersection with said hole; and position indicating means provided at least partly within said head and including an indicating part on said feeler stud arranged within said opening in such a manner as to be located within the light beam passing through said bore, so that said indicating part and changes in the position thereof can be observed by looking through said bore.

4. In an indicating inside caliper, in combination, an elongated handle; a head xed to said handle at one end thereof and provided with a hole being open at one end and located perpendicularly to said handle a'nd a bore being open at both ends and extending through said head perpendicularly to said hole and intersecting the same, said head having a caliper face on that side of said head which is located opposite said open end of said hole; a feeler stud arranged slidably in said hole projecting at its front end through said open end of said hole and passing through the intersection of said hole with said bore, said feeler stud having an opening permitting passage of a light beam at least through a part of said bore at its intersection with said hole; and position indicating means provided at least. partly within said head land including a transparent indicating member in said feeler stud arranged wtihin said' opening in such a manner as tobe located within the light beam passing through said bore, so that said indicating part and changes in the position thereof can be observed by looking through said bore.

5. In an indicating inside caliper, in combination, an elongated handle; a head xed to said handle at one end thereof and provided with a hole being open at one end and located perpendicularly to said handle and a bore being open at both ends and extending through said head perpendicularly to said hole and intersecting the same, said head having a caliper face on that side of said head which is located opposite said open end of said hole; a feeler stud arranged slidably in said hole projecting at its front end through said open end of said hole and passing through the intersection of said hole with said bore, said feeler stud having an opening permitting passage of a light beam at least through a part of said bore at its intersection with said hole; position indicating means provided at least partly within said head and including a transparent indicating member in said feeler stud arranged within said opening in such a manner as to be located within the light beam passing through said bore, so that said indicating part and changes in the position thereof can be observed by looking through said bore; and a lens in said bore for magnifying said transparent member in said opening in said feeler stud.

6. In an indicating inside caliper, in combinaf tion, a handle; a head fixed to said handle and provided with a hole and a bore extending through said head and intersecting said hole; a feeler stud arranged slidably in said hole passing through the intersection thereof with said bore, said feeler stud being shaped so as to permit passage of light at least through a part of said bore at its intersection with said hole; position indicating means provided at least partly within said head and including an indicating part on said feeler stud arranged Within the intersection of said hole and said bore so that said indicating part and changes in the position thereof can be observed by looking through said bore; spring means permanently tending to slide said feeler stud in said hole in outward direction; locking means permanently tending to lock said feeler stud in its position in said hole; and manually operable releasing means for releasing said locking means, thereby permitting said feeler stud to slide under action of said spring means in outward direction.

7. In an instrument for inside measurement, a handle, a head xed to said handle and provided With a radial hole, a feeler stud comprising a wedge portion, slidably arranged in said radial hole, a spring supported on said feeler stud to urge the latter outwardly along said radial hole, a wedge slidably guided in said head, a spring supported on said wedge to press the latter onto said wedge portion to hold said feeler stud in test position against the constraint of said rst-mentioned spring, wedge-releasing means movably mounted in said handle and coupled with said wedge to temporarily release said feeler stud to allow the latter to be urged outwardly by said first-mentioned spring, said head having a bore open at both ends thereof and intersecting said radial hole, and transparent test indicating means comprising parts mounted in said head and visible through said bore and parts mounted on said feeler stud to be visible through said bore.

8. In an instrument for inside measurement, a handle, a head xed to said handle and provided With a radial hole, a feeler stud comprising a wedge portion, slidably arranged in said radial hole, a spring supported on said feeler stud to urge the latter outwardly along said radial hole, a wedge slidably guided in said head, a spring supported on said wedge to press the latter onto said wedge portion to hold said feeler stud in test position against the constraint of said first-mentioned spring, Wedge-releasing means movably mounted in said handle and coupled with said wedge to temporarily release said feeler stud to allow the latter to be urged outwardly by said rst-mentioned spring, said head having a bore open at both ends thereof and Yintersecting said radial hole, transparent test indicating means comprising parts mounted in said head and visible through said bore and parts mounted on said feeler stud to be visible through said bore, and optical magnifying means mounted on said head in alignment with said bore.

HANS HAIDEGGER.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,141,396 Jubinville June 1, 1915 1,431,613 Wittner Oct. 10, 1922 1,439,989 Avander et al Dec. 26, 1922 1,775,952 Turrettini Sept. 16, 1930 2,010,301 Helfer Aug. 6, 1935 2,223,182 Muller Nov. 26, 1940 2,227,883 Grobe Jan. 7, 1941 FOREIGN PATENTS Number Country Date 68,847 Switzerland July 1, 1914 OTHER REFERENCES Publ.: Microtecnic Aug. 1947, Swiss, vol. 1, No. 4, pp. 189-191. 

